Every language pair has its interference patterns - spots where your native language steers you into errors. For English speakers learning French, certain mistakes come up so reliably you can anticipate them before you make them.
Tu vs. vous
French has two words for "you": tu (informal, for friends, family, children) and vous (formal, for strangers and in polite contexts). English speakers default to tu because there's only one "you" in English. Using tu with someone you've just met can come across as rude.
When in doubt, use vous. Wait for the other person to suggest switching to tu.
Adjective agreement
French adjectives agree with the noun in gender and number. A common error: un livre intéressant (correct) vs. une livre intéressant (wrong - should be intéressante). This trips up English speakers because English adjectives don't change at all. The fix is drilling agreement patterns until they become automatic.
Physical states with avoir, not être
English says "I am hungry/cold/right." French uses avoir (to have): J'ai faim, J'ai froid, J'ai raison. Learn these expressions as fixed phrases rather than trying to translate from English.
Silent final consonants
In English we pronounce most final consonants. In French they're almost always silent. Vous parlez - the "z" is silent. Ils mangent - the "ent" is silent. Trop - the "p" is silent. Dictation practice helps here: it forces you to distinguish what you actually hear from what you expect to hear based on spelling.
Il y a for "ago"
English speakers often say *Il est deux ans for "two years ago." The correct form is Il y a deux ans - literally "there has two years." Memorize il y a for elapsed time early - it comes up constantly.
Liaison rules
Liaison is pronouncing a normally silent final consonant before a word starting with a vowel. Vous avez sounds like "vouz-avez." Les amis sounds like "lez-amis." English has nothing equivalent, so beginners skip it entirely. Extensive listening and dictation practice are the main fixes.
Savoir vs. connaître
Both mean "to know" but they're not interchangeable. Savoir = knowing a fact or how to do something (Je sais nager - I know how to swim). Connaître = knowing a person or place (Je connais Paris). Ask yourself: person or place? Use connaître. Fact or skill? Use savoir.
Articles after negation
After negation, indefinite articles (un, une, des) normally change to de: J'ai un chien becomes Je n'ai pas de chien. Many beginners keep the original article and say *Je n'ai pas un chien. Practice negation patterns until the switch happens automatically.
Overusing très
English speakers translate every "very" as très. French uses different intensifiers depending on the adjective. Some adjectives take vraiment, others tellement, others fort or bien. When you read or listen to French, notice which intensifier goes with which adjective.
Translating "any" as quelque
"Do you have any bread?" - many learners write *Avez-vous quelque pain? Correct: Avez-vous du pain? The partitive article does the work here. Learn du, de la, de l', des and how they function in questions and negations - it's one of the most distinctly French concepts and worth dedicated time early on.
How to actually fix these
Knowing about a mistake and stopping yourself from making it are two different things. The only real fix is sustained exposure to correct French combined with targeted practice. Regular reading through our reading exercises and listening through our dictation exercises will gradually replace bad habits with correct patterns.